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Syncer Common Logic

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/*
 *
 *  * Copyright The Athenz Authors
 *  *
 *  * Licensed under the Apache License, Version 2.0 (the "License");
 *  * you may not use this file except in compliance with the License.
 *  * You may obtain a copy of the License at
 *  *
 *  *     http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  * Unless required by applicable law or agreed to in writing, software
 *  * distributed under the License is distributed on an "AS IS" BASIS,
 *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  * See the License for the specific language governing permissions and
 *  * limitations under the License.
 *
 */

package com.yahoo.athenz.syncer_common;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;

public class Config {
    private static final Logger LOGGER = LoggerFactory.getLogger(Config.class);

    public static void loadProperties(String propFile) {

        Properties prop = new Properties();
        try (InputStream is = new FileInputStream(propFile)) {
            prop.load(is);
        } catch (Exception ex) {
            throw new RuntimeException("Error while loading " + propFile, ex);
        }

        if (prop.isEmpty()) {
            throw new RuntimeException("No data set in " + propFile);
        }

        LOGGER.info("Loading system properties from {}...", propFile);
        Enumeration enumeration = prop.propertyNames();
        while (enumeration.hasMoreElements()) {
            String key = (String) enumeration.nextElement();
            String value = prop.getProperty(key);

            if (!value.isEmpty()) {
                System.setProperty(key, value);
                LOGGER.info("property name={}, value={}", key, value);
            }
        }
    }
}